GASTEROPODA. 



175 



four tentacula, cylindrical and retractile, two of which 

 have eyes at the summit ; foot separated from the 

 body by a furrow. — About 30 species. 



These Mollusca live in shady and damp places, 

 among moss and short grass, and are found in 

 Great Britain, Germany, Sweden, Celebes, &c. ™p™ 

 The little shells are distinguished from young naldi - 

 specimens of the Helix by their never being umbilicated 

 or perforated ; they greatly resemble them in other par- 

 ticulars, and are often mistaken for the young state of the 

 garden snail. 



Succinea. Draparnaud. ( Cochlohydra Fer.). — Shell 

 oval, small, thin, and transparent ; spire very short, con- 

 sisting of only two or three whorls ; 

 right lip thin, left smooth; aperture 

 large, oblong; no operculum. Animal 

 bulky ; head with four tentacula ; the 



* t Succinea amphibia. 



upper ones stout and inflated, the lower 

 very short; foot very large; dentition intermediate be- 

 tween Helix and Vitrina* — About 60 species; also fossil. 



The animal cannot entirely enter its shell ; it lives upon 

 herbs and shrubs on the borders of water, and appears to 

 be almost amphibious. Sowerby remarks that it is some- 

 times below the surface of the water, but that it does not 

 live habitually in it, as it breathes air. The species are 

 found in England, many parts of Europe, Van Diemen's 

 Land, &c. &c. 



Helix. Lin. — Shell globular, convex, or flattened; 

 spire not much elevated ; mouth wide, not lorg, placed 

 very obliquely to the axis of the shell ; lips disunited by 

 the projection of the last whorl, never pearly, but polished ; 



* Forbes's British Moll. 



